Acquisition (Details) (USD $)	3 Months Ended		6 Months Ended		3 Months Ended	6 Months Ended		12 Months Ended	3 Months Ended	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013 Kenny [Member]	Jun. 30, 2013 Kenny [Member]	Dec. 31, 2012 Kenny [Member] employee office	Dec. 31, 2012 Notes Payable to Banks [Member]	Jun. 30, 2013 Construction [Member] Kenny [Member]	Jun. 30, 2013 Construction [Member] Kenny [Member]
Business Acquisition [Line Items]
Business Acquisitions, Pro Forma Information, Adjustment Payments					$ 4,600,000
Total purchase price							141,114,000
Amortization expense	2,300,000	1,000,000	4,500,000	2,100,000	181,000	362,000			1,600,000	3,200,000
Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Cash And Equivalents							53,185,000
Proceeds from Lines of Credit								70,000,000
Entity Number of Employees							475
Number Of Offices							12
Business Acquisitions, Post-Closing Adjustment, Expected Payment					$ 3,900,000	$ 3,900,000